Revert "Revert "Update the UIDs only after the native network is created""

This reverts commit 13b96bc6.

Reason for revert:
- The reverted CL fixes a bootloop on Fi devices and must be submitted again for droidfood stability purposes.
- It's not clear whether the revert actually fixes the test that prompted it.

Change-Id: I68200501d1c587d1c6b3ad81053175c74961a440